Theorem psubclssatN 40577

Description: A closed projective subspace is a set of atoms. (Contributed by NM, 25-Jan-2012.) (New usage is discouraged.)

Hypotheses

Ref	Expression
psubclssat.a	⊢ 𝐴 = (Atoms‘𝐾)
psubclssat.c	⊢ 𝐶 = (PSubCl‘𝐾)

Assertion

Ref	Expression
psubclssatN	⊢ ((𝐾 ∈ 𝐷 ∧ 𝑋 ∈ 𝐶) → 𝑋 ⊆ 𝐴)

Proof of Theorem psubclssatN

Step	Hyp	Ref	Expression
1		psubclssat.a	. . 3 ⊢ 𝐴 = (Atoms‘𝐾)
2		eqid 2765	. . 3 ⊢ (⊥𝑃‘𝐾) = (⊥𝑃‘𝐾)
3		psubclssat.c	. . 3 ⊢ 𝐶 = (PSubCl‘𝐾)
4	1, 2, 3	psubcliN 40574	. 2 ⊢ ((𝐾 ∈ 𝐷 ∧ 𝑋 ∈ 𝐶) → (𝑋 ⊆ 𝐴 ∧ ((⊥𝑃‘𝐾)‘((⊥𝑃‘𝐾)‘𝑋)) = 𝑋))
5	4	simpld 499	1 ⊢ ((𝐾 ∈ 𝐷 ∧ 𝑋 ∈ 𝐶) → 𝑋 ⊆ 𝐴)

Syntax hints:   → wi 4   ∧ wa 400   = wceq 1563   ∈ wcel 2145   ⊆ wss 3907  ‘cfv 6525  Atomscatm 39899  ⊥_𝑃cpolN 40538  PSubClcpscN 40570

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2215  ax-ext 2737  ax-sep 5251  ax-nul 5261  ax-pow 5327  ax-pr 5395

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1566  df-fal 1576  df-ex 1803  df-nf 1807  df-sb 2094  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3080  df-rex 3090  df-rab 3418  df-v 3459  df-dif 3910  df-un 3912  df-in 3914  df-ss 3924  df-nul 4289  df-if 4484  df-pw 4560  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4869  df-br 5106  df-opab 5168  df-mpt 5187  df-id 5547  df-xp 5658  df-rel 5659  df-cnv 5660  df-co 5661  df-dm 5662  df-iota 6481  df-fun 6527  df-fv 6533  df-psubclN 40571

This theorem is referenced by:  pmapidclN  40578  psubclinN  40584  paddatclN  40585  pclfinclN  40586  poml6N  40591  osumcllem3N  40594  osumcllem9N  40600  osumcllem11N  40602  osumclN  40603